[Inportant Question] PermissionsEx.

So I've got permissions-ex installed on my server, but users can't build in any of the multiverse worlds. Help me! I've set up the permissions right but here they are:
user:
build: true
inheritance: guest
prefix: '&e &f' worlds: survival: build: true creative: build: true permissions: - essentials.spawn - essentials.tpa - essentials.help - essentials.mail - essentials.mail.send - essentials.kit - essentials.motd - essentials.nick - essentials.realname - essentials.afk - essentials.whois - essentials.rules - essentials.nick.color - essentials.back - essentials.sethome - essentials.home - essentials.tpaccept - essentials.tpahere - essentials.tpdeny - essentials.chat.color - essentials.chat.url - essentials.list - essentials.me - essentials.helpop - essentials.seen - multiverse.access.* - multiverse.portal.access.* - modifyworld.* - permissionsex.build - permissionsex.chat - modifyworld.chat - modifyworld.build HELP ME! Thanks :)